Table of Contents
ppmshift - shift lines of a portable pixmap left or right by a random
amount
ppmshift shift [ppmfile]
Reads a portable pixmap
as input. Shifts every row of image data to the left or right by a certain
amount. The 'shift' parameter determines by how many pixels a row is to be
shifted at most.
Another one of those effects I intended to use for MPEG
tests. Unfortunately, this program will not help me here - it creates too
random patterns to be used for animations. Still, it might give interesting
results on still images.
Check this out: Save your favourite model's
picture from something like alt.binaries.pictures.supermodels (ok, or from
any other picture source), convert it to ppm, and process it e.g. like this,
assuming the picture is 800x600 pixels: # take the upper half, and
leave it like it is
pnmcut 0 0 800 300 cs.ppm >upper.ppm
# take the lower half, flip it upside down, dim it and distort it a
little
pnmcut 0 300 800 300 cs.ppm | pnmflip -tb | ppmdim 0.7 |
ppmshift 10 >lower.ppm
# and concatenate the two pieces
pnmcat -tb upper.ppm lower.ppm >newpic.ppm
The resulting picture looks like the image being reflected on a water
surface with slight ripples.
ppm(5)
, pnmcut(1)
, pnmflip(1)
, ppmdim(1)
,
pnmcat(1)
Copyright (C) 1993 by Frank Neumann
Table of Contents